MTTC Missed Topics Practice Test

Ballistic panspermia is the idea that life can spread between planets within the same solar system by rocks or dust that are ejected from one world by a planetary impact, travel through space like a projectile, and potentially deliver microorganisms to another planet. The “ballistic” term emphasizes the rock’s travel as a simple physical projectile, not a guided voyage. This concept is a subset of lithopanspermia, where rocks act as ships that shield organisms from space conditions for at least part of their journey, making interplanetary transfer within a solar system plausible under some circumstances. The other ideas describe different notions: intentional spreading by intelligent beings is directed panspermia; forming organic molecules in a reducing atmosphere relates to how life’s building blocks could originate chemically on a planet; and self-replicating RNA carrying genetic information refers to an early RNA-based stage of life, not interplanetary transfer.